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Old 05-24-2004, 08:38 PM
J-Chuck J-Chuck is offline
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Fail-safe thermostats

I am in the Birmingham area and I cannot find a fail-safe thermostat (a thermostat that fails in the open position). Where can I find one?
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Old 05-25-2004, 09:04 AM
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I may be showing my ignorance here, but I've never heard of one of those. Every thermostat that's ever failed on me has always been in the open position.
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Old 05-25-2004, 09:32 AM
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They are fairly new vetteonr. As to finding one in Birmingham (I am assuming Alabama) I would suggest NAPA or a speed shop. The last time I was in Birmingham I couldn't find me. LOL
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Old 05-25-2004, 11:45 PM
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They're not that new in Canada. We've had them available for 10 years.

Those thermostats are manufactured by Motorad. Every Canadian Tire store stocks them, as well as most Auto Value stores in Western Canada.

Not sure about the US, but up here, jobbers carry either Stant or Motorad thermostats. Call your local parts stores and ask them which line they carry.

DJS
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Old 05-26-2004, 08:03 PM
J-Chuck J-Chuck is offline
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Fail-safe thermostats

Thanks raceman. I will check with my local parts house.
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Old 05-26-2004, 08:38 PM
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Check Auto Zone.

They advertise a failsafe thermostat.
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Old 05-27-2004, 12:40 AM
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I've never heard of these, but T-stats seldom fail in a closed possition.

Besides, you should change the T-stat once every two years no matter what........most people don't! Including me!
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Old 06-01-2004, 12:30 AM
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Hmmm. . . . . . every thermostat that has failed on me has failed in the closed position.

The Stant and regular (i.e. non-Fail Safe) Motorad thermostats I've seen use the spring to hold the valve in the closed position. For example:



When the opening temperature is reached, the (usually) wax pellet material contained in the base of the thermostat retracts the valve (yes, AGAINST the flow of coolant) and coolant is allowed past the thermostat and into the radiator.

When the wax pellet material is faulty, the spring holds the valve closed, allowing the engine to overheat.

1fatcat is correct: we should be changing thermostats every 2 years, when the coolant is changed. But like everything else on our vehicles, the quality has increased to the point where we barely have to do anything to them for 6 or 8 years.

DJS
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Old 06-01-2004, 11:22 PM
1fatcat 1fatcat is offline
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Quote:
Originally posted by 1fatcat
but T-stats seldom fail in a closed possition.
I guess I say this because most of the T-stats that I replace are being replaced because they stick open and cause too low of opperating temps for the engines fuel injection to opperate properly, and because of too little of heat in the winter.

Lots of people are driving around with stuck open T-stats and don't know it because the engine isn't overheating. But it does affect the heater output and the fuel ecconomy of an engine.
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Old 06-02-2004, 01:14 AM
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i chased that low heater output on the truck my wife had been driving, turned out the t-stat was bad, and we had a bad temp sending switch
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Old 06-02-2004, 09:07 AM
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Some people with bad thermostats will just slide a piece of cardboard in front of the radiator. Not a very good idea.
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Old 06-02-2004, 08:02 PM
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Yeah, and then in the dead of summer when temps hit 102 F, they forget about that piece of cardboard and overheat the engine.

Cardboard: $Free
T-stat, gasket, coolant: $40.00
Engine: $2,500
Fixing it right the first time: $Priceless!
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Old 06-02-2004, 08:50 PM
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Quote:
Originally posted by vetteonr
Some people with bad thermostats will just slide a piece of cardboard in front of the radiator. Not a very good idea.
Hey! You ever change a T stat when it was 40 below? LOL Mine get changed when I change my coolant.
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